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zswap: potential NULL dereference on error in init_zswap()

Message ID 20200114050902.og32fkllkod5ycf5@kili.mountain (mailing list archive)
State New, archived
Headers show
Series zswap: potential NULL dereference on error in init_zswap() | expand

Commit Message

Dan Carpenter Jan. 14, 2020, 5:09 a.m. UTC
The "pool" pointer can be NULL at the end of the init_zswap().  (We
would allocate a new pool later in that situation.)  So in the error
handling then we need to make sure pool is a valid pointer before
calling "zswap_pool_destroy(pool);" because that function dereferences
the argument.

Fixes: 93d4dfa9fbd0 ("mm/zswap.c: add allocation hysteresis if pool limit is hit")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
 mm/zswap.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/mm/zswap.c b/mm/zswap.c
index 7ec8bd912d13..55094e63b72d 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -1359,7 +1359,8 @@  static int __init init_zswap(void)
 	return 0;
-	zswap_pool_destroy(pool);
+	if (pool)
+		zswap_pool_destroy(pool);